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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        // 1、先声明
        // 对象 字面量{}    new Object()
        let obj = {
            name: '大黄',
            age: 3,
            sex: '公'
        }
        console.log(obj.name);
        console.log(obj['age']);
    </script>
</body>

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